Abstract
The adsorption of hydrocarbons, thiophenes, esters, acids, and anilines on MoS 2 and on sulfurized CoMoAl 2O 3 and Al 2O 3 catalysts has been investigated by a chromatographic method at 200 °C. The polarity of catalysts, estimated from differences in the adsorption of alkanes and aromatic hydrocarbons, decreases in the order Al 2O 3 > CoMoAl 2O 3 > MoS 2. This order correlates with the ratio of the activity for H 2S elimination from saturated sulfur compounds (proceeding without participation of hydrogen) to the hydrogenation-dehydrogenation activity of the catalysts which decreases in the same sequence. The nonspecificity of the MoS 2 surface compares with the surface of graphitized carbon black, and both acids and anilines are eluted easily from this surface. Adsorption capacities of alkanes at the origin of the isotherm, related to unit BET surface, differ for individual catalysts. These are 9:3:1 for MoS 2:CoMo Al 2O 3:Al 2O 3, respectively, this ratio being little dependent upon the n-alkane used for comparison (C 7C 10). The pore distribution has been determined from the desorption branch of N 2 isotherm. The surface of CoMoAl 2O 3 catalyst consists of pores which are approximately five times smaller than those of MoS 2 and Al 2O 3 catalysts.
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